Gurgling Mire

The Gurgling Mire is a swampy patch of land located east of Andros, south of Patras, and west of Ostermark.

Geography
The Gurgling Mire is a cold saltwater swamp roughly 100 miles long by 30 miles wide along the shore. It is a desolate place full of monsters and few members of the civilized races. The swamp has constantly grown over time, swallowing homes and property located close to its boundaries. It is believed that the eastern boundary of the mire is magically bound to the Blackford Road (perhaps via a wish spell from the mire's creator), since attempts to reroute the road were futile and only caused the expansion of the swamp.

The mire itself is full of trees, vines, quicksand, and hidden islands, and it is generally covered in fog, making visibility very poor. The bones of fallen creatures are clearly visible throughout the mire. The water is deep enough that it could be navigated on a flat-bottomed boat, but the dark water and hidden obstructions make that choice dangerous.

Inside the mire are

the flooded ruins of a number of castles and settlements. Many of the castles had strange wards that would either strengthen certain magic or negate it.